Hi..
On your 91 Lexus Ls400.
The starter motor is located :
Rear of the Engine. Under the Intake Manifold.
You can see unless you remove the intake.
Becuase for replace the Starter Motor on your car
You will need to REMOVE the INTAKE MANIFOLD.
To get axces to the Starter Motor.

The Aproximate time for Remove and Install the starter is:
5.1 Hours, labor.
I'm a Mechanic.
I hope this help on your question.
Thank you for use fixya..

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Sounds like the starter is going bad it is located on the engine no pun intended . The starter will be located where the engine and the transmission come together that is called the bell housing. The starter starts the car by way of the fly wheel dont worry you cant see the fly wheel just a little FYI. If you change it your self make sure to unhook the battery first to prevent a spark.

good luck to change the starter you gotta take off the front axle its so dumb u cant get to it unless you do that. good luck.. my advice take it into a mechanic. u really do have to remove the whole front axle

hi from uk to locate starter on any car including yours follow the positive lead from the battery and at the other end it is connected to the starter solenoid the starter on your car should be at the rear side of engine as you lookunder bonnet it is next to bulkhead and is secured with thre 13 mm spanner sized bolts b4 you disconnect starter cables DISCONNECT THE BATTERY EARTH LEAD !! IF YOU TELL EXACTLY WHAT IS HAPPENING ? WHEN YOU SAY WO'NT START? we may be able to help with diagnosis b4 you tackle starter ?

The power distribution box is
located in the engine compartment.
The power distribution box contains
high-current fuses that protect your
vehicle’s main electrical systems
from overloads.
The starter relay is in position #56 of that box.